• Made with silicone rubber material that won't scratch your saxophone. • Helps maintain proper back pressure in the horn, facilitating airflow through all the keys while blowing less air. • Can be used in various positions within the instrument to modify the tone. • Easy to place on the saxophone bell at the desired angle. • Hand washable with mild detergent and air dried. • Product dimensions: 0.1 cm wide, 0.1 cm high, and 0.1 cm long. • Product weight: 0.052 kg.